Dear all,

I run linux in the DM3730 torpedo module with file system stored in a yaffs partition. I test the performance of the CPU to read data from a USB CDC ACM device. The application JUST reads the data from the device but it DOESN'T stores the data in the file system. The USB device sends data at a rate of 888000 bytes per second. When the application is running the following traces appears in the console:

Quote:

[ 100.138488] cdc_acm 2-1.2:1.0: This device cannot do calls on its own. It is not a modem.
[ 100.147460] cdc_acm 2-1.2:1.0: ttyACM0: USB ACM device
491
[ 103.850280] omap_device: omap_i2c.1: new worst case deactivate latency 0: 183105
[ 106.157867] yaffs: **>> Block 1173 needs retiring
[ 106.167938] yaffs: **>> Block 1174 needs retiring
[ 106.176147] yaffs: **>> Block 1175 needs retiring
[ 106.185333] yaffs: **>> Block 1176 needs retiring
[ 106.191925] yaffs: **>> Block 1177 needs retiring
[ 106.202697] yaffs: **>> Block 1178 needs retiring
[ 106.210327] yaffs: **>> Block 1179 needs retiring
[ 106.216674] yaffs: **>> Block 1180 needs retiring
[ 106.225738] yaffs: **>> Block 1181 needs retiring
[ 106.232116] yaffs: **>> Block 1182 needs retiring
[ 106.239349] yaffs: **>> Block 1183 needs retiring
[ 106.249542] yaffs: **>> Block 1184 needs retiring
[ 106.256927] yaffs: **>> Block 1185 needs retiring
[ 106.263336] yaffs: **>> Block 1186 needs retiring
[ 106.272949] yaffs: **>> Block 1187 needs retiring
[ 106.280487] yaffs: **>> yaffs write required 16 attempts
[ 130.248229] yaffs: **>> Block 1173 retired
[ 130.252655] yaffs: Block 1173 is in state 9 after gc, should be erased
[ 132.256072] yaffs: **>> Block 1174 retired
[ 132.260498] yaffs: Block 1174 is in state 9 after gc, should be erased
[ 134.263854] yaffs: **>> Block 1175 retired
[ 134.268280] yaffs: Block 1175 is in state 9 after gc, should be erased
[ 136.271453] yaffs: **>> Block 1176 retired
[ 136.275878] yaffs: Block 1176 is in state 9 after gc, should be erased
[ 138.279449] yaffs: **>> Block 1177 retired
[ 138.283874] yaffs: Block 1177 is in state 9 after gc, should be erased
[ 140.287322] yaffs: **>> Block 1178 retired
[ 140.291748] yaffs: Block 1178 is in state 9 after gc, should be erased
[ 142.295196] yaffs: **>> Block 1179 retired
[ 142.299621] yaffs: Block 1179 is in state 9 after gc, should be erased
[ 144.302978] yaffs: **>> Block 1180 retired
[ 144.307403] yaffs: Block 1180 is in state 9 after gc, should be erased
[ 146.310638] yaffs: **>> Block 1181 retired
[ 146.315063] yaffs: Block 1181 is in state 9 after gc, should be erased
[ 148.318511] yaffs: **>> Block 1182 retired
[ 148.322937] yaffs: Block 1182 is in state 9 after gc, should be erased
[ 150.326416] yaffs: **>> Block 1183 retired
[ 150.330841] yaffs: Block 1183 is in state 9 after gc, should be erased
[ 152.334167] yaffs: **>> Block 1184 retired
[ 152.338592] yaffs: Block 1184 is in state 9 after gc, should be erased
[ 154.342193] yaffs: **>> Block 1185 retired
[ 154.346618] yaffs: Block 1185 is in state 9 after gc, should be erased

Which is the reason of the behavior?

Joaquim Duran